Patent GB-1350506-A (GB)
Title: Method and apparatus for winding two pole dynamoelectric machine field coils
IPC: H02K15/04
Filed: 1971-11-09
Abstract: 1350506 Coil winding apparatus; shearing ESSEX INTERNATIONAL Inc 9 Nov 1971 [28 Dec 1970] 52054/71 Headings B3A and B3W Apparatus for winding field coils of a dynamoelectric machine stator, which coils include first and second pole groups (66) (76), Fig. 6 (not shown), of concentric coils, comprises first and second stepped collapsible coil forms 44, 46, each having a forward distal end and a rear proximal end mounted on a rotatable turret 52, means for winding wire 36 on the coil forms, means for rotating the turret, and means for holding the starting end of the wire at a location adjacent the smallest step of one of the coil forms so that the smallest coil is initially wound and the remaining coils wound progressing rearwardly toward the proximal end of the coil form and, without severing the wire wound from the proximal end to the distal end of the other coil form. At the beginning of winding, the starting end of the wire is clamped in a clamping and cut-off mechanism 146, Fig. 23, with both coil forms 44, 46 pivoted downwardly and the gun 42 of a winding flyer in its upper vertical position 42-1, Fig. 16. The coil forms are pivoted horizontally and a rod 136 on the coil form 44 engages the wire end. A piston-rod 142, Fig. 16, is extended into a slot 154 formed between expanded parts 44-1, 44-2 of the coil form and as the flyer rotates the part 58-2 of the wire end 58 engages the rod and slides along it until the wire is wound around the smallest coil form parts 54-2, 54-1. As the flyer rotates it is oscillated axially to level-wind the turns. Before the smallest coil is fully wound, the rod 142 is retracted as the turns already wound anchor the end 58. The flyer is stepped axially after each coil is wound and the wire end 58, which extends along side 140 of the coil form, is pushed into the slot 154 as the coils are wound over it. Prior to completion of winding the largest coil, blocks 156, 158 of the clamping and mechanism 146, Fig. 23, are opened to release end 58-1 of the wire end 58. When the coil is fully wound, the flyer is stopped in its uppermost position, the turret 52 is indexed to bring coil form 46 to the winding position and the second pole group 76 is wound starting with the largest coil in conventional fashion. When winding is completed, the flyer is fully retracted with the gun 42 in its uppermost position and clear of the coil form, Fig. 20 (not shown). A hook 164 is extended through the blocks 156, 158 to engage the end (88) of the wire. The turret 52 is again indexed, pulling wire from the gun so that the wire end (88) is retained by a spring (170), Fig. 12 (not shown), on the opposite side of the turret to the interpole connection (74). The hook 164 is retracted drawing wire through the blocks 156, 158. The blocks are then closed and a portion 88-2 of the wire is clamped between edges 176, 178 and cut by a blade 174 while a section 88-1 lies in a cut-out portion 172 and is not clamped. The coil forms 44, 46 are pivoted downwardly, the turret is moved into alignment with coil inserter blades 90, Fig. 12, and the coil forms lowered, whereupon a sleeve 132 transfers the groups of coils to the blades. The clamped finishing end 88-2 now becomes the new starting end 58 and the apparatus is re-set for a new winding cycle. In an alternative embodiment, Figs. 24-27 (not shown), a clamping and cut off mechanism (176<SP>1</SP>) is located between coil form parts (44-1), (44-2) and replaces the rod 142. Initially it is in alignment with the gun (42), the wire starting end (58) being clamped between blocks (182), (184) and located in a slot (188) in the coil form. The mechanism (176<SP>1</SP>) is retracted, pulling wire from the gun whereupon winding proceeds as in the previous example and when completed the starting end (58) is released from the blocks, to allow removal of the coils. The finishing section (88-2) is still held in the blocks (156), (158) as in the previous embodiment and is engaged by a hook (200) of the mechanism (176<SP>1</SP>), which draws it into the now advanced blocks (182), (184). The blocks are closed, thereby clamping and severing the section (88-2) and providing a new starting end (58). Blocks (156), (158) are opened to release the completely severed section (88-2), and the flyer rotated to bring the gun into its uppermost position with the wire located in the slot (188).